CLLLC谐振变换器变频移相控制策略  

Control Strategy of Frequency Variation and Phase Shift for CLLLC Resonant Converters

作　　者：宋佰超 SONG Baichao(College of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学自动化工程学院,上海200090

出　　处：《电工技术》2024年第2期22-25,共4页Electric Engineering

摘　　要：针对CLLLC谐振变换器存在脉冲频率调制(PFM)的电压增益范围不足、移相调制(PSM)下只能实现降压功能、负载投切扰动对输出电压影响较大问题,提出了一种可分别调节开关频率与移相比的变频移相控制方法。该方法可以根据输入电压范围自由切换控制模态,实现宽电压范围软开关;通过引入线性自抗扰控制(LADRC)策略,减小了负载投切扰动对输出电压的影响,并与传统PI算法进行了对比。最后,通过PLECS仿真验证了理论分析的正确性和控制策略的有效性。CLLLC resonant converters have insufficient voltage gain range in pulse frequency modulation(PFM),single function limited to step-down in phase shift modulation(PSM),and output voltage susceptible to load switching disturbance.This paper proposes a control method for frequency variation and phase shift,which can adjust switching frequency and shift ratio separately.The method can change control mode freely according to input voltage range,realizing soft switching in a wide voltage range.By introducing linear active disturbance rejection control(LADRC)strategy,the influence of load switching disturbance on output voltage is reduced.PLECS simulation of the proposed control method in comparison with traditional PI algorithms finally verified correctness of theoretical analysis and effectiveness of the control strategy.

关 键 词：CLLLC谐振变换器 变频移相控制 线性自抗扰控制 

分 类 号：TM76[电气工程—电力系统及自动化]